Swarf is a word for metal particles or debris produced in polishing metal with abrasive tools. For example, swarf can be produced when polishing teppanyaki grill or sharpening knives.
I often see Kebab sellers who don't wipe their knives after sharpening and cut cooked meat. Teppanyaki grills are often polished but without washing them thoroughly. Without any doubt many people still consume such contaminated food as if it is safe.
Is it safe to eat food contaminated with swarf? Is there any scientific article that support the conclusion?